This is a very good Terran opener build. It works best against Protoss and Terran, but it is usual against Zerg as well.
I am using this build in almost every matches.
10 Supply Depot
14 Supply Depot (Finish Wall-in... every map is different)
17 Orbital Command
17 Tech Lab (First Barracks)
17 Supply Depot
18 2nd Barracks
20 3rd Barracks
20 Supply Depot
24 Reactor on 2nd Barracks
26 Supply Depot
MAKE SUPPLY DEPOTS NONSTOP WITH 1 SCV
27 Tech Lab on 3rd Barracks
CONSTANTLY MAKE 2X MARINES AND 2X MARAUDERS FROM ALL BARRACKS.
35 2nd Refinery
PUSH OUT ONCE FIRST MARAUDER SPAWNS FROM 3RD BARRACKS
Constantly produce units.
Hope this will help and Good luck!!!!